Floor-surfacing machine



Aug. 11, 1925.

J. K. MAGNUSSON FLOOR SURFACINGMACHINE Filed Feb. 14, 1924 2 Sheets-Sheet 1 INVENTOR ATTORNEYS- J. K. MAGNUSSON.

FLOOR SURFACING MACHINE Filed Feb. 14. 1924 2 Sheets-Sheet 2 ATTORNEYS Aug. 1 1, 1925.

MLI===== surfacing elements.

Patented Aug. ll, i925.

ra'ras JOHN K. lviaenusson, or YONKERS, new YORK.

To all whom it may concern.-

Be it known that I, JOHN K. MAGNUssON, a citizen of the United States of America, residing at Yonkers, New York, have invented a new and useful Floor-Surfacing Machine, of which the following is a specification.

My invention relates to a floor surfacing machine. i

It is an object of the invention to provide a floor surfacing machine which may be advantageously used on either did and worn or on new floors, for forming a uniform surface thereon.

It is a further object to provide a floor surfacing machine in which the surfacing elements are mounted in amain frame, and in which a floor bearing'plate is mounted for up and down adjustment so as to vary the depth of cut. 1

It is another object to provide a novel form of floor bearing plate for a surfacing machine. i

It is a further. object to provide novel means for automatically moving the surfacing element to cutting position when the machine is moved in one direction and for raising the surfacing element from the floor on a block, which is rotatably supported in' the main frame, and a suitable form of motor secured to the frame serves to drive the surfacing elements so as to perform the surfacing operation on a floor. The knives are spaced from the floor by a floor bearing plate, which is adjustable relatively to the frame for adjusting'the depth of cut by the The adjustment between the main frame'and' the floor plate may be effected by manual means, and in addition I prefer to provide mechanism for automatically lowering the main frame relatively to the floor plate when the machine is moved in one direction, which mechanism also raises the frame relatively to the floor plate when the machine is moved in another direction.

In the drawings: which show, for illustramooa-strazeaome MACHINE.

rear of the machine.

Application filed February 14, 1924. Serial No. 692,730. 1

tive purposes a preferred form of the in vention Fig. 1 is a side view of a floor surfacing machine embodying features of my invention; i

Fig. 2 is a bottom plan viewvof the same machine; V

Fig. 8 isan enlarged sectional view taken substantially in the plane of the line 38 of Fig. 1;

Fig. 4 is a sectional view taken substantially in the. plane of the line 4 4 of Fig. 3.

In said drawings, 5 indicates the main frame upon which the various elements of the machine are mounteolf 6 indicates a block carrying the surfacing elements which, in the present disclosure, are knives 77.- The block has journals 89 which are suitably supported in enclosed anti-friction bearings 10-11 on the main frame 5. The journal 9 is preferably extended somewhat beyond the frame and carries a sprocket or pulley 12. A motor 13 is carried by the frame 5, and a suitable chain or belt 14 servesto connect the sprocket on the motor shaft with the sprocket 12, for operating the cutting knives.

In the preferred form shown it will be noted that the cutting elements are permanently mounted in the main frame, that is to say, they are rotatable, but are not adjust able relatively to the main frame.

As shown particularly in Figs. 1 and 4, the frame 5 is enlarged into a hood 15 for enclosingthe cutting knives and preventing chips and dust from being blown about indiscriminately during the operation of the machine. 16 indicates the outlet of the hood 15, and a suitable conveyor tube or guard 17 is secured to the outlet 16 and serves to convey the chips and dust to the The draft or force for so conveying away the chips in the present instanceis furnished by the knives themselves, during the rotation thereof.

A floor bearing plate 18 serves to support the forward end of the main frame 5'. In the form shown the floor plate extends substantially from one side of the" frame to the other, and embodies the front and back bearing bars 19-20, which are connected at opposite lateral sides by connecting bars 21 22. In effect the floor plate. is a block having a rectangular opening therein for permitting the passage of the oiitting 'ele ments, as will be clear from Figs. 2, 3 and 4.

In the form shown the floor plate has projecting gudgeons or trunnions 23-24, and an eccentric bushing 25 is rotatablg mounted on each of the gudgeons 23-24. supporting frame or plate 26 supports each eccentric bushing 25 and serves as a bearing therefor. Each plate 26 is connected, as by means of rods 27-27, to a cross-bar 28. Each cross-bar in turn has a threaded opening for receiving a screw 29 mounted for rotation in the main frame 5, which screws are preferably provided at their upper ends with sprockets, which may be connected by means of a chain 30 in order that both screws 29 may be manually operated simultaneously.

It will thus be seen that the floor plate 18, through the means just described, serves to support the front end of the main frame 5, which in turn supports the cutting knives. If the two screws 29-29 are rotated .in one direction, the cross-bars 28-28 connected to the frames or plates 26-26 move the floor plate in one direction so as to either raise or lower the cutting knives relatively to the floor surface. Such is the manual adjustment of the cutting knives. I prefer, in addition, to provide means for automatically lowering the knives into cutting position upon movement of the machine in one direction and for elevating the knives from the cutting position upon a movement of the machine in the other direction. In the form shown collars 31-31 are fixedly secured to the eccentric bushings 25-25, and each collar has a projecting arm 32, which arms are connected by means of links 33-33 to arms 3434 at opposite sides of the frame 5, which arms are carried by a shaft 35 mounted in the main frame 5. The shaft 35 carries a collar 36 non-rotatably secured thereto, and a suitable type of friction device, such as the roller 37, is journaled on the shaft 35 and is urged in one direction by means of the spring 38. Any suitable type of friction clutch 39 may be interposed between the collar 36 and the roller 37. Pins 40-41 on the frame 5 limit the extent of oscillation of the arms 34-34.

The operation of the automatic means just described is as follows:

When the machine is moved in, say, the forward direction from the position shown in Figs. 1 and 2, the friction roller 37,

through the friction clutch 39 and collar 36 secured to the shaft 35, rotates the shaft in a counter-clockwise direction as viewed in Fig. 1. This action moves the links 33-33, and consequently the arms 32-32 secured to the eccentric bushings, toward the left as viewed in said Fig. 1. As will be obvious, movement of the arms 32-32 rotates the eccentric bushings 25-25, and such rotation raises trunnions 23-24 carrying the floor plate 18. When the floor plate is raised relatively to the main frame, obviously the knives are projected downwardly relatively to the floor and into the cutting position. When the machine is drawn in the opposite direction, that is, toward the right as viewed in F ig. l, the reverse operation takes place and the floor plate 18 is lowered into the position shown in the drawing and the knives are raised to an elevation out of cutting position. Since the roller 37 is connected to the shaft 35 by some sort of friction clutch, the machine is permitted to move and the clutch to slip.

The frame may be provided with a roller 45, upon which the machine may roll when being transported from one position to another. A suitable handle 46 is attached to the frame and is used for moving the machine over the floor during the cutting op eration or when transporting the machine from place to place.

The operation may be brifly described as follows:

The machine is placed on a floor and, by means of the chain and sprockets, the floor plate 18 is adjusted so as to position the cutting knives just above the floor surface when the automatic means is in the position shown in the various figures. When the knives are thus properly positioned, a forward movement of the machine will automatically cause the knives to descend and effect the proper cut. Any slight variations, of course, may be corrected by again adjusting the sprockets and screws 29-29 so as to get just the desired depth of cut. Chips and dust are thrown up by means of the knives through the outlet 16 and conducted through the guard or conduit 17 to the rear of the machine. Since the machine in opera tive position is supported by the comparatively large floor plate 18 and the roller 37, it will be obvious that the floor will be uniformly surfaced, since slight depressions in the floor will not permit the plate 18 to descend and cause the cutting knives to take a deeper out. It will also be clear that, dur ing the relatively fast rearward or backing movement of the machine, the knives are not in cutting position, and consequently the floor will not be marred by the knives striking the floor at some distance apart, as probably would be the case if the knives were not elevated during the rearward movement.

While I have described a preferred form of the invention, I do not wish to be strictly limited thereto for changes may be made within the scope of the appended claims.

I claim:

1. In a floor surfacing machine, a main supporting frame, a surfacing element rotatably carried by said frame, a slotted floor bearing plate tiltably carried by said frame for supporting the surfacing element adjacent a floor surface, said surfacing element protruding through the slotted portion of said plate, and means for automatically lowering the surfacing element relatively to said bearing plate upon a forward movement of the machine on the floor.

2. In a floor surfacing machine, a main supporting frame, a surfacing element rotatab-ly carried by said frame, a slotted floor frame, a surfacing element rotatably carried by said frame, a slotted floor bearing plate supported adjacent the surfacing element and extending across substantially the entire Width thereof and at the front and rear thereof, a tiltable connection between said plate and frame comprising trunnions arranged at each end of said plate, and means for driving said surfacing element.

4. In a floor surfacing machine, a main supporting frame, a surfacing element rotatably carried thereby, a slotted floor bearing plate, means; for tiltably connecting the same to said frame at a point adjacent to the ends of said surfacing element and having floor bearing portions at the front and rear of said element, between which portions the surfacing element projects during the floor surfacing operation, and means for driving said surfacing element.

5. In a floor surfacing machine, a main frame, a surfacing element rotatably car ried by said frame, a slotted floor bearing plate supported adjacent the surfacing element and extending across substantially the entire width thereof and at the front and rear thereof, a tiltable connection between said plate and frame comprising trunnions arranged at each end of said plate, means for driving said surfacing element, and adjustable bearing boxes for said trunnions for raising and lowering the floor bearing plate relatively to the cutter to effect a predetermined limit to the depth of the cut.

6. In a floor surfacing machine, a main supporting frame, a floor surfacing element carried thereby, a floor bearing element coacting therewith, and means frictionally engaging a floor surface for automatically lowering said surfacing element relatively to said floor bearing element upon a forward movement of said machine on the floor.

7. In a floor surfacing machine, a main supporting frame, a floor surfacing element carried thereby, means frictionally engaging a floor surface for automatically lowering said surfacing element into engagement with a floor upon a forward movement of said machine on the floor and for automatically elevating said surfacing element above the floor when the main supporting frame is moved along the floor in another direction, and means for limiting the depth of cut of said surfacing element.

8. In a floor surfacing machine, a rotatable surfacing element, a floor bearing plate coacting therewith, an eccentric mounting therefor, a main supporting frame for said members, and means for moving said eccentric mounting for varying the distance between the axis of said surfacing ele ment and the floor engaging surface of said floor bearing plate for automatically lifting the surfacing element from the floor on the idle movement of the machine.

9. In a floor surfacing machine, a main supporting frame, a plurality of knife ele ments rotatably supported in said main frame, a floor bearing plate tiltably supported by said frame and having a passage through which said knife elements may protrude, manual means for shifting said knife elements and floor bearing plate relatively to each other for varying the depth of out of said knife elements, and automatic means for raising and lowering said knife elements relatively to the floor surface upon opposite slliding movement of said machine along the oor.

' JOHN K. MAGNUSSON. 

